[John]

A customer of mine use to have an old Ayk Turbo. (1986-88 beast)
Had 10 - 2000W lamps. Would meter about 85-95 at the body. It was 25 minutes per side. Yes 25 per side! You would come out with awesome color & mild dehydration.
Granted there was very low UVB, we never did meter with a 6.0 or 7.0. They got about 15-16 years of use out of those.

Drew Factor was 2125+ per side!